Carburetor



35 V ap earing Wlll be heremafter set forth, e invention consists ,of thenovel con- Patented F cl). 26, .1929.

y j UNITED STATES PATENT ,OFFICE.

nvmnm R. SLAGLE, on SAYRE, PENNSYLAKA, ASSIGNOR1O STANDARD VA UUJK BRAKE 00., CF CAMDEN, ,NEW JERSEY, A CORPORATION NEW JERSEY.

camatnmor;

Application flledipril 13, 1926. Serial'No. 101,693.

opening in opposite directions, of which valves the air cOntrolling valve is arranged to be unseated a trifie in advance 01 the liquid controlling valve.

A further object of the present invention, is*to provide a carburetor of the type re,

cited in Which a rocker arm is provided for carrying the air controlling valve at one end, the free end of said rocker arm being spaced from the liquid control valve by means of a spring, whereby the air controlling valve must.be unseated slightly before the liquid controlling valve can be, unseated by the rocker arm. l

A further object of the present invention is to provide a carburetor of the character stated inwhich the casing is two-part and separated by a division plate which division plate is provided with an air port anda liquid port controlled by valvesopenmg m opposite directions.

A further object ofjthe presentinvention .is to provide an arrangement and construction of parts for attaining the function set forth in the aforesaidobjects.

Other and further objects not at.this time st1uction hereinafter described and finally Claimed. r

'The nature, .characteristic fea tres. and scope.of the invention will be more fully understood from the following, description taken in connection with the accompanymg drawings forming part hereof, and in which:

Fig. 1, is a view in cross-section of a multiple valve carburetor embodying the invention. V i 7 Fig. 2, is a view in plan with the casing 2, as'shown in Fig. l,.rem o ve d.

Fig. 3, is a fragmentary view illustrating details of construction of the liquid controlling valve shown at the right hand side of Fig. 1. 7 7

Forthe purposeof illustrating my inven- 5 ti0n Ihave shown in the accompanying drawings one form thereof which *is at present preferred by me, since the sam has been found in practice to -give satisfactory an d.reliable results, although it is to be understood that the various instrumentalities 01: which my invention consists can be variously arrangedand organized and that my invention is not limited to theprecise ar rangement and organization of the instrumentalities as herein shown'and described. 1 designates my novel construction ofcar buretor, thesame comprising a Casir1g, which may be in two sections, an:upper section 2 and a lower section 3 having the intermediate' plate or partition 4 and the upper and lower gaskets 5 and 6, whereby-an air-tight structure is produced, said casing sections and gaskets being heldin assembled position by any suitable means. v

7 designates a threaded nipple which is adapted to be screwed into the intake manifold of an internal combustion engine, said nipple communicating with the mixing chamber 8within the casing section 2. 9 designates the air inlet for the admission of air under atmospheric pressure or less to the chamber 10, the exit therf rom being controlled by the-air valve 11, which is.mounted on the valve stem 12, which also carries the washer.or the like 13. The upper end of the valve stem is pivotallConnect&ed at 14 to, the rocker arm 15, which is fulcrumed at the points 16. .In order that the rocker arm 15 may be supported so that frictionmay be reduced t0 a minimum, I 'provide the pivot screws 17 which are mounted in the luge 18 and provided with the lock nuts 19, the

inner .ends 16 of; said pivot screws engaging r c0nical seats.20 on the opposite sides ofthe rocker arm 15, V

21 designates a spring bearing'on the under side ofthe rocker arm 15 and tending to keep the valve 11 normally closed( 22 designates a valve stem, positioned in a port 23, in the partition 4, of someWhat larger diameter than the valve stem 22, said.

valve stemearryingthe gasoline contr0lling valve 24 at its lower'end and 'atits upper portion being provided with: a"plurality cf adjusting nuts 25 for adjusting the tension 01 the spring 26 positioned between the lower of said nuts and the top of the partition4. By making the port 23 larger than the stem V 22 a suificiently large passage is provided for the gasoline t0 flow freely to the desired point. 27 designates a liquid inlet, for in- 7 stance, for the admission of gasoline ztbove vvhich is the constantly open port 28 communicating with the chamber 29 below said valve 24;. The nipple 7 is screwecl intothe intake mariifold. In this position, when the inotor is idling, there is created in its'intake manifold and the passage 7 and chamber 8,

a vacuum equivalentto 18 to 22 inchesof nnercury. Under these conditions, valve 11 is drawn from its scat permitting the ad- '22, causing the valve 24 to bemoved from its, seat thereby pei*mitting the gasoline from a source of supply, which communic'ateswith the passage 27, to be drawn throghthe ports 28 and 23 and thence into the mixirig chamber 8, where it is mixed With the air being draWn from the chamber 10 (and so passes through the passage or opening 7 into the intake manifold, causing the mixture in theintake manifold to be 'combustible thereb preventing the motor V from stalling, Which would be the case if any quantity of pure air unmiXed with gasoline were. admitted into the intake manifold.

, As the vacuum is increased, the movement of the valve 11 is correspondinglyshortened 7 and When the vacuum has increased to Such a degree which is determined by the spring. tension 26 on the valve stem 22, the valve 24- Will close so that no additi0nal gasoline will be mixed with the small quantity of air entering the motorunder these conditions.

.When the motoris stopped, the valve 11 prtavents drawing air back through the motor whioh wouldtend to destroy thevacuum, so 7 7 at oneend the air controlling valve Which is V that this valve 11 isa combined check and below the mixingvalve or above it, as the v mixingvalve; V'Theopening 27 commnnicateS 7 with a source of supply, wluch 1s preferably a tank of an automobile and inasmuch as when tlns valve 24 1s in operat1on there is a vacuum in the chamber 8,it isof no importance whether Or not the tank is vacuum in chamber 8 would cause the gasoline to flo-vv through the ports 28 and 23.

By reason of the special, pivotal arrange- "ment of rocker arm 15 which is normally under spring tension as at 21, atmospher1c' pressure. or pressure less than atmospheric pressure causes the unseat1ng of valve Il a trifie in advanoeof the unseating ofValve 24.

:WhatI claim is: -1. In a. carburetor, a casing comPr1s1ng' a jinletsand adapted to coinmunicate vvith an 7 intake manifold, a mixing chamber in the upper of said casing sections, valves seating for movement in oppositeddirections with respect to said partition and controlling the inlets'to said mixingcharnber,a rocker.arm arranged in the 'chamber ofsaid upper section and carrying atone endthe air control-g ling Valve WhlClllS arranged to open upwardly with respect to said partition, and having at its opposite end a gasoline valve arranged to move doWnWardly With respect to said partition, a spring for normally holding the latter valve upwa'rdly .to its scat, and a spring bearing on said rocker mmfoi nornially holding the 'air 'valve clown tipon its seat, the free end of said rocker arm being adapted-to unseat and depress said gasoline valve during the upward opening of said air valve.

.2. In a carburetor, a casing comprising a single upper and a single loWer section having a partition and upperfmd lower gaskets interposed between said Sections, said lower section having anair inlet and a gasolin'einlet Which inlts are opp0sitely disposrd, an outlet in said upper section and arranged, at right angles to said inlets and adapted to communicate with an intake manifold, a mixing chamberin the upper of said'caSing sections, valves seating for movement in opposite directions witl 1 respect tdsaid par tition and controlling the inlets to said mix ing chamber, a rocker arm arranged in the chamber of said upper section aficlbarrying arranged to-open upwardly with respect to said partition, and} having atits opposite end a -gasoline valve arranged to' move down, wardly with respect to said partition, spr1ng for normally holding the latter valve upwardly:to its scat, asprifig bearing on said rocker arm for normally holding the air valve down.upon its s'eat, the -free end of said rocker arm ,beirigadapted to unseat and depresssaidgasoline valve during the upward opening of said air valve, said rocker arm having oppositely disposed conical seats, and oppositely located adjuStable pivot screWs engagihg said bonical seats, said twopart casing containing all of said parts, 

